SANTA ANA (CBSLA.com) — A bank robbery suspect is in custody Thursday afternoon after police say he robbed a bank, then tried to carjack three motorists before commandeering a bicycle.

Roberto Guillermo Dorantes, 36, was arrested Thursday after robbing a Bank of the West branch, 3900 S. Bristol St., at about noon, police said.

FBI agents say Dorantes was armed with a steak knife and wore a blue UCLA baseball cap backwards when he demanded money from the teller in Spanish. The teller complied, passing him money that had a dye pack hidden inside.

Police say Roberto Guillermo Dorantes, 36, was positively identified by a carjacking suspect and as a robber by a bank teller. (credit: CBS)